Quiz | Structure and Reactivity
Which compound is most acidic?
When comparing the acidity of different molecules, it is actually easier to compare the stability of their respective bases ⇒ less stable base = strongest base ⇒ strongest base = weakest acid
The more electronegative an atom, the stronger the inductive attracting effect and the more stable the base
Electronegativity: F > Cl > Br > I
Which compound is most basic?
Lone pairs of electrons are stabilized by the s character of orbital. The % of s character is 25% in sp3 hybridization, 33% in sp2 and 50% in sp. Therefore, increasing basicity correlates with hybridization as follows: sp < sp2 < sp3
Which compound is an ether?
CH3CH2CH2COH ⇒ aldehyde; CH3CH2CH2COOH ⇒ carboxylic acid; CH3CH2OCH2CH3 ⇒ ether; CH3CH2COCH3 ⇒ ketone
What is the correct IUPAC name of (CH3)2CHCH2CH(CH2CH2CH3)2?
1) Longest chain: 7 carbon atoms ⇒ heptane
2) 1 methyl substituent + 1 propyl substituent
3) The left end is the closest to a subst.: number the C atoms from the left to the right
Which of the following compounds is a Lewis Base?
All of the above
A Lewis base is a substance that donates an electron pair: H2O has 2 pairs of electrons on oxygen ⇒ it is a Lewis base
A Lewis acid is a substance that accepts an electron pair: BH3 and AlCl3 are electron-poor species (boron and aluminium need electrons to follow the octet rule) ⇒ BH3 and AlCl3 are Lewis acids
Which of the following cannot react as a nucleophile?
CH3O+H2 is an electrophile: electron-poor species that can form a covalent bond by accepting an electron pair from a nucleophile. Indeed the oxygen atom is positively charged and therefore poor in electrons